linux-kernel - Re: WARNING in io_uring

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Message-ID: <778cd3c3-5b2c-4a87-64dc-5b8f5b0edc7a@kernel.dk>
Date:   Sat, 13 Apr 2019 09:25:13 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     syzbot <syzbot+cd714a07c6de2bc34293@...kaller.appspotmail.com>,
        hare@...e.com, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: WARNING in io_uring_setup

On 4/13/19 2:26 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    8ee15f32 Merge tag 'dma-mapping-5.1-1' of git://git.infrad..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=146b7cd3200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4fb64439e07a1ec0
> dashboard link: https://syzkaller.appspot.com/bug?extid=cd714a07c6de2bc34293
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15d8b397200000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10b62ab7200000
> 
> The bug was bisected to:
> 
> commit 6c271ce2f1d572f7fa225700a13cfe7ced492434
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Thu Jan 10 18:22:30 2019 +0000
> 
>      io_uring: add submission polling
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=170a286b200000
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=148a286b200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=108a286b200000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+cd714a07c6de2bc34293@...kaller.appspotmail.com
> Fixes: 6c271ce2f1d5 ("io_uring: add submission polling")
> 
> WARNING: CPU: 1 PID: 7600 at include/linux/cpumask.h:121 cpu_max_bits_warn  
> include/linux/cpumask.h:121 [inline]
> WARNING: CPU: 1 PID: 7600 at include/linux/cpumask.h:121 cpumask_check  
> include/linux/cpumask.h:128 [inline]
> WARNING: CPU: 1 PID: 7600 at include/linux/cpumask.h:121 cpumask_test_cpu  
> include/linux/cpumask.h:344 [inline]
> WARNING: CPU: 1 PID: 7600 at include/linux/cpumask.h:121  
> io_sq_offload_start fs/io_uring.c:2244 [inline]
> WARNING: CPU: 1 PID: 7600 at include/linux/cpumask.h:121 io_uring_create  
> fs/io_uring.c:2851 [inline]
> WARNING: CPU: 1 PID: 7600 at include/linux/cpumask.h:121  
> io_uring_setup+0x13b2/0x1990 fs/io_uring.c:2903
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 1 PID: 7600 Comm: syz-executor594 Not tainted 5.1.0-rc4+ #65
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
> Google 01/01/2011
> Call Trace:
>   __dump_stack lib/dump_stack.c:77 [inline]
>   dump_stack+0x172/0x1f0 lib/dump_stack.c:113
>   panic+0x2cb/0x65c kernel/panic.c:214
>   __warn.cold+0x20/0x45 kernel/panic.c:571
>   report_bug+0x263/0x2b0 lib/bug.c:186
>   fixup_bug arch/x86/kernel/traps.c:179 [inline]
>   fixup_bug arch/x86/kernel/traps.c:174 [inline]
>   do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
>   do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
>   invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
> RIP: 0010:cpu_max_bits_warn include/linux/cpumask.h:121 [inline]
> RIP: 0010:cpumask_check include/linux/cpumask.h:128 [inline]
> RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:344 [inline]
> RIP: 0010:io_sq_offload_start fs/io_uring.c:2244 [inline]
> RIP: 0010:io_uring_create fs/io_uring.c:2851 [inline]
> RIP: 0010:io_uring_setup+0x13b2/0x1990 fs/io_uring.c:2903
> Code: 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 0f 84 18 fe ff  
> ff 48 89 df e8 e8 80 e0 ff e9 0b fe ff ff e8 2e 79 a8 ff <0f> 0b e9 db f8  
> ff ff e8 22 79 a8 ff 49 8d 9c 24 88 00 00 00 48 b8
> RSP: 0018:ffff8880a8eb7dc0 EFLAGS: 00010293
> RAX: ffff88808cdd8700 RBX: 0000000000000400 RCX: ffffffff81c80eab
> RDX: 0000000000000000 RSI: ffffffff81c815d2 RDI: 0000000000000005
> RBP: ffff8880a8eb7ef0 R08: ffff88808cdd8700 R09: ffffed1011c75244
> R10: ffffed1011c75243 R11: ffff88808e3a921f R12: ffff88808d34a480
> R13: ffff8880a8eb7ec8 R14: ffff88808d34a4c0 R15: ffff88808d34a4d4
>   __do_sys_io_uring_setup fs/io_uring.c:2916 [inline]
>   __se_sys_io_uring_setup fs/io_uring.c:2913 [inline]
>   __x64_sys_io_uring_setup+0x54/0x80 fs/io_uring.c:2913
>   do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
>   entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x440239
> Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7  
> 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff  
> ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007fff32156718 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9
> RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440239
> RDX: 0000000000400b60 RSI: 0000000020000200 RDI: 0000000000000c9f
> RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
> R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401ac0
> R13: 0000000000401b50 R14: 0000000000000000 R15: 0000000000000000
> Kernel Offset: disabled
> Rebooting in 86400 seconds..

Thanks for the report, below should fix it.

-- 
Jens Axboe